uaccess.h revision 294825 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
6 * Copyright (c) 2015 Fran��ois Tigeot
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice unmodified, this list of conditions, and the following
14 *    disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/uaccess.h 294825 2016-01-26 14:21:30Z hselasky $
31 */
32#ifndef	_LINUX_UACCESS_H_
33#define	_LINUX_UACCESS_H_
34
35#include <linux/compiler.h>
36
37#define	__get_user(_x, _p) ({				\
38	int __err;					\
39	__typeof(*(_p)) __x;				\
40	__err = -copyin((_p), &(__x), sizeof(*(_p)));	\
41	(_x) = __x;					\
42	__err;						\
43})
44#define	__put_user(_x, _p) ({			\
45	__typeof(*(_p)) __x = (_x);		\
46	-copyout(&(__x), (_p), sizeof(*(_p)));	\
47})
48#define	get_user(_x, _p)	-copyin((_p), &(_x), sizeof(*(_p)))
49#define	put_user(_x, _p)	-copyout(&(_x), (_p), sizeof(*(_p)))
50
51/*
52 * NOTE: The returned value from pagefault_disable() must be stored
53 * and passed to pagefault_enable(). Else possible recursion on the
54 * state can be lost.
55 */
56static inline int __must_check
57pagefault_disable(void)
58{
59	return (vm_fault_disable_pagefaults());
60}
61
62static inline void
63pagefault_enable(int save)
64{
65	vm_fault_enable_pagefaults(save);
66}
67
68#endif	/* _LINUX_UACCESS_H_ */
69